refactor state handling to make application available independent of the state

src/application/Context/ApplicationContextFactory.ts

@@ -0,0 +1,31 @@
+import { ApplicationContext } from './ApplicationContext';
+import { IApplicationContext } from '@/application/Context/IApplicationContext';
+import { OperatingSystem } from '@/domain/OperatingSystem';
+import { Environment } from '../Environment/Environment';
+import { IApplication } from '@/domain/IApplication';
+import { IEnvironment } from '../Environment/IEnvironment';
+import { IApplicationFactory } from '../IApplicationFactory';
+import { ApplicationFactory } from '../ApplicationFactory';
+
+export async function buildContextAsync(
+    factory: IApplicationFactory = ApplicationFactory.Current,
+    environment = Environment.CurrentEnvironment): Promise<IApplicationContext> {
+    if (!factory) { throw new Error('undefined factory'); }
+    if (!environment) { throw new Error('undefined environment'); }
+    const app = await factory.getAppAsync();
+    const os = getInitialOs(app, environment);
+    return new ApplicationContext(app, os);
+}
+
+function getInitialOs(app: IApplication, environment: IEnvironment): OperatingSystem {
+    const currentOs = environment.os;
+    const supportedOsList = app.getSupportedOsList();
+    if (supportedOsList.includes(currentOs)) {
+        return currentOs;
+    }
+    supportedOsList.sort((os1, os2) => {
+        const getPriority = (os: OperatingSystem) => app.getCollection(os).totalScripts;
+        return getPriority(os2) - getPriority(os1);
+    });
+    return supportedOsList[0];
+}